Physics · Engineering Mechanics
If three coplanar, concurrent, and balanced forces P, Q, and R act on a body at angles α, β, and θ opposite to them respectively, then according to Lami's theorem:
- 1Pcos(α) = Qcos(β) = Rcos(θ)
- 2Psin(α) = Qsin(β) = Rsin(θ)✓
- 3Pcos(θ) = Qcos(α) = Rcos(β)
- 4Psin(θ) = Qsin(α) = Rsin(β)
Correct answer
Psin(α) = Qsin(β) = Rsin(θ)
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